cooley



(No Model.)

A C. H. GOOLEY.

VALVE OPERATING MECHANISM FOR GRAIN SCALES. No. 402,510. Patented Apr.30, 1889.

UNITED STATES t l iAPtl) 15% ll. COOLEY, OF HARTFORD, CONNECTICUT,ASSIGN TO Tillt FEAT. d: \YIIITNEY COMPANY, OF SAME PLACE.

VALVE-OPERATING MECHANISM FOR GRAIN-SCALES.

SIEGIFICATION forming part of Letters Patent No. 402,510, dated April30, 1889.

Application filed November 12, 1888 $erial No. 290,635. (No model.)

To all 10700722. it may concern.-

13c itknown that 1, CHARLES H. 000mm, a citizen of the United States,residing at Hartford, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements in ValveOperating Mechanism for Grain-Scales, of which the following is aspecification.

This invention is in the nature of an improvement on the mechanism for asimilar purpose which is described in the United States Patent No. 32,130, granted to John W. Hill July 15, 188i.

The object of my present improvements is to furnish means operating inconnection with the toes K of said patent for positively limiting thefirst downward movement of the grain-bucket, this movement being due tothe weight of the major part of the load of grain in said bucket.

In the drawings accompanying an d forming a part of this specification,Figure l a side elevation of those parts of the grain-scale shown insaid prior patent which comprise my inun'o'vemcnts. Figs. 2 and 3 aresimilar views ill ustrating the operation of the devices. Fig. is a rearview of the toe K and certain other details. F 5 shows a modified formand arrangmneut of the said toe K and the hook carried thereon.

Similar characters designate like parts in all the figures.

The grain-spout SPof said patentis shown herein chiefly by dotted lines,being broken away the better to show the operative details. Thefollowing several parts herein shown are supposed to be substantiallythe same as the corresponding parts similarly designated in said priorpatent, to wit: The scale-beam 13, 'he valve-shaft J, the shaft-bearingsG, the valves II and H, the valve-supporting arms 11 and 7t and theirclutches, (not herein shown,) the gravity-pawl. L, pivot Z, and stop I),the toes K, operated by said pawl L, and the cam-stop M, which isattached to beam B by screws oz.

The toe Kflwhich I prefer to call the stopcam, is similar in itsconstruction and functions to the same part in llills said patent; but Iattach to said cam a hook or stop,-4, for msitivoly limiting thedownward motion of cam-stop M prior to the closing of valve ll. Thishook. is pivotally connected to the cam at about the point 3, and hasprojecting end, 5, on which the stop M strikes. The positions of thestop ill and cam K during the time the grain-bucket is receiving themajor part of its lead are shown in Fig. 1. (then the main weight isover-balanced and the beam l; descends, the stop M goes directly downonto hook 5, thereby stopping the downward movement of the beam. at apoint where the cam K can swing back from its position in 1 to that inFig. 2, thus closing the main valve ll. This movement carries the hook.5 from. under cam )I, so that at the next downward impulse of the beam(when the supplemental weight is lifted) the cam-stop M clears said hookand descends to-its lowest limit, in Fig. On the rising of the beam thepawl L lifts the toe K and swings forward cam 11?, and again carriesstep )i upward to its position in Fig. 1, the hook i swinging back (notshown) in the meantime to permit such movement of said step, and thenfalling forward. with the end 5 thereof underneath the stop.

The form and arrangement of the hook may be varied from that shown inFigs. 1 to is without altering the essential character thereof. One suchmodification is shown in Fi in which the said hook i is carried on arigid arm, (3, depending from said cam 1' Inthis case the hook is or maybe in the natureolfan ordinary gravity-pawl, and is limited in. itsforward movement by the stop 7 on said arm (3. A spring (not shown) maybe employed to hold said pawl at normally against the stop '7.

It will be remembered by those practically acquainted with this class ofgrain-scales that the first downward movementof the beam begins at themoment the increasing load of grain overbalances the main weight, andthat since the flow of grain continues said load is constantlyaugmenting as the bucket and beam descend. Consequently it is evidentthe said motion of the beam is constantly accelerating, so that the loadis acting when the beam takes up thesu iiplemental weight,both by itsrear weight and byits momentum, and it happens often in practice thatthese two forces combined will lift the supplementz'il weightprematurely sufficiently to allow the IOO stop M to pass under thesecond notch K of said cam K 7 This allows the valve H to close tooearly, thereby cutting off the grainsupply and thus stopping theoperation of the machine. By my improvements, however, the said effectsof the loads momentum added to its Weight are effectually overcome. Theresult is that not only is the aforesaid uncertainty obviated, but thesupplemental Weight may be largely reduced relatively, the flow of grainbe increased, and in general a higher et'fieiei'icy of the machineattained.

Having thus described my invention, I claim 1. In a grainscale, thecoinbination,with a

